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   难度：Medium
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   <h1 class="question_title">
    49. Group Anagrams
   </h1>
   <p>
    Given an array of strings, group anagrams together.
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   <p>
    <strong>
     Example:
    </strong>
   </p>
   <pre>
<strong>Input:</strong> <code>["eat", "tea", "tan", "ate", "nat", "bat"]</code>,
<strong>Output:</strong>
[
  ["ate","eat","tea"],
  ["nat","tan"],
  ["bat"]
]</pre>
   <p>
    <strong>
     Note:
    </strong>
   </p>
   <ul>
    <li>
     All inputs will be in lowercase.
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    <li>
     The order of your output does not&nbsp;matter.
    </li>
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   <h1 class="question_title">
    49. 字母异位词分组
   </h1>
   <p>
    给定一个字符串数组，将字母异位词组合在一起。字母异位词指字母相同，但排列不同的字符串。
   </p>
   <p>
    <strong>
     示例:
    </strong>
   </p>
   <pre><strong>输入:</strong> <code>["eat", "tea", "tan", "ate", "nat", "bat"]</code>,
<strong>输出:</strong>
[
  ["ate","eat","tea"],
  ["nat","tan"],
  ["bat"]
]</pre>
   <p>
    <strong>
     说明：
    </strong>
   </p>
   <ul>
    <li>
     所有输入均为小写字母。
    </li>
    <li>
     不考虑答案输出的顺序。
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